___________there are many different types of food, some animals spend their lives eating only one type.
A．SinceB．Unless C．OnceD．While
D

試題分析：考查連詞：A. Since自從B. Unless除非C. Once一旦，     D. While雖然，當(dāng)…時候，句意：雖然有很多不同類型的食物，一些動物一生只吃一種食物。選D。
點評：首先掌握各種連詞的含義和作用，在做題時要弄清上下文的邏輯關(guān)系。
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